© National Instruments
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2-9
I/O Connector Signal Description
Table 2-3 describes the signals found on the I/O connectors.
Table 2-3.
I/O Connector Signal Descriptions
Signal
Names
Reference
Direction
Description
COM <0..7>
—
—
Analog Input Isolated Ground—These
terminals are the reference point for
differential analog input measurements.
AI <0..7>+,
AI <0..7>-
COM
<0..7>
Input
Analog Input Channels 0 to 7—AI+ and
AI- are the positive and negative inputs of
differential analog input.
PFI <0, 1>
COM 7
Input
Programmable Function Interface
Channels 0 to 1—Each of these terminals
can be individually configured as PFI
terminals. They can be used to supply a
start, reference, or pause trigger, or be used
as an external timing source for AI.
Note
: These channels may only be
referenced to channel 7 in order to
maintain safety isolation.
RSVD
COM 7
Bi-Directional
These pins are reserved for
communication with the accessory.